What is the definition of risk?
a. putting money into more than one investment
b. amount made in profit on an investment
c. using borrowed funds for an investment
d. possibility of losing money on an investment

The answer is "D. possibility of losing money on an investment".

Risk is the likelihood of losing something of significant worth. Qualities, (for example, physical wellbeing, economic wellbeing, passionate prosperity, or budgetary riches) can be picked up or lost when going for broke coming about because of a given activity or inaction, anticipated or unanticipated (arranged or not arranged). Risk can likewise be characterized as the deliberate cooperation with uncertainty. Uncertainty is a potential, erratic, and wild result; chance is an outcome of move made regardless of vulnerability.  

b. take periodic breaks and alternate between tasks.  

will increase work efficiency, and avoid health issues.